package com.atguigu.repservice.entity.excel.listener;


import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.repservice.entity.RepSubject;
import com.atguigu.repservice.entity.excel.SubjectData;
import com.atguigu.repservice.service.RepSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    //因为SubjectExcelListener不交给spring进行管理，需要自己new，不能注入其他对象
    //不能实现数据库操作
    public RepSubjectService subjectService;

    public SubjectExcelListener() {
    }

    public SubjectExcelListener(RepSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //读取excel内容，一行一行进行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (subjectData == null) {
            throw new GuliException(20001, "文件数据为空");
        }

        //一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
        //判断一级分类是否重复
        RepSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (existOneSubject == null) { //没有相同一级分类，进行添加
            existOneSubject = new RepSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());//一级分类名称
            subjectService.save(existOneSubject);
        }

        //获取一级分类id值
        String pid = existOneSubject.getId();

        //添加二级分类
        //判断二级分类是否重复
        RepSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if (existTwoSubject == null) {
            existTwoSubject = new RepSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());//二级分类名称
            subjectService.save(existTwoSubject);
        }
    }

    //判断一级分类不能重复添加
    private RepSubject existOneSubject(RepSubjectService subjectService, String name) {
        LambdaQueryWrapper<RepSubject> wrapper = new LambdaQueryWrapper();
        wrapper.eq(RepSubject::getTitle, name);
        wrapper.eq(RepSubject::getParentId, "0");

        RepSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //判断二级分类不能重复添加
    private RepSubject existTwoSubject(RepSubjectService subjectService, String name, String pid) {
        LambdaQueryWrapper<RepSubject> wrapper = new LambdaQueryWrapper();
        wrapper.eq(RepSubject::getTitle, name);
        wrapper.eq(RepSubject::getParentId, "0");
        RepSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        System.out.println("Excel表格已经读取完毕！");
    }
}
